[PATCH 2/3] drivers:input:ps2 Added sunxi A20 ps2 driver, changed makefile and Kconfig

vishnupatekar
2014-12-03T22:53:44Z

---
drivers/input/serio/Kconfig | 9 ++
drivers/input/serio/Makefile | 1 +
drivers/input/serio/sunxi-ps2.c | 305 +++++++++++++++++++++++++++++++++++++++
3 files changed, 315 insertions(+)
create mode 100644 drivers/input/serio/sunxi-ps2.c

diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index bc2d474..1a86e41 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -281,4 +281,13 @@ config HYPERV_KEYBOARD
To compile this driver as a module, choose M here: the module will
be called hyperv_keyboard.

+config SERIO_SUNXI_PS2
+ tristate "Allwinner Sun7i-A20 PS/2 controller"
+ default m
+ help
+ Say Y here if you have Sun7i-A20 Allwinner PS/2 ports.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sunxi-ps2.
+
endif
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 815d874..0fa0f78 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_SERIO_ARC_PS2) += arc_ps2.o
obj-$(CONFIG_SERIO_APBPS2) += apbps2.o
obj-$(CONFIG_SERIO_OLPC_APSP) += olpc_apsp.o
obj-$(CONFIG_HYPERV_KEYBOARD) += hyperv-keyboard.o
+obj-$(CONFIG_SERIO_SUNXI_PS2) += sunxi-ps2.o
diff --git a/drivers/input/serio/sunxi-ps2.c b/drivers/input/serio/sunxi-ps2.c
new file mode 100644
index 0000000..ccd7b29
--- /dev/null
+++ b/drivers/input/serio/sunxi-ps2.c
@@ -0,0 +1,305 @@
+/*
+ * sunxi-ps2.c Support for Allwinner A20 PS2 host controller
+ *
+ * Author: Aaron.maoye <leafy.myeh-Q9AEpCAkrSgqDJ6do+/SaQ@public.gmane.org>
+ * Vishnu Patekar <vishnupatekar0510-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ * Based on sunxi-ps2.c 3.0 kernel
+ *
+*/
+
+#include <linux/module.h>
+#include <linux/serio.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#define DRIVER_NAME "sunxi-ps2"
+
+#define RESSIZE(res) (((res)->end - (res)->start)+1)
+
+#define SW_PS2_GCTRL (0x00)
+#define SW_PS2_DATA (0x04)
+#define SW_PS2_LCTRL (0x08)
+#define SW_PS2_LSTAT (0x0c)
+#define SW_PS2_FCTRL (0x10)
+#define SW_PS2_FSTAT (0x14)
+#define SW_PS2_CLKDR (0x18)
+
+/* SW_PS2_GCTRL */
+#define SWPS2_BUSEN (1 << 0)
+#define SWPS2_MASTER (1 << 1)
+#define SWPS2_RESET (1 << 2)
+#define SWPS2_INTEN (1 << 3)
+#define SWPS2_INTFLAG (1 << 3)
+
+/* SW_PS2_LCTRL */
+#define SWPS2_LCTL_NOACK (0x0 << 18)
+#define SWPS2_LCTL_TXDTOEN (0x1 << 8)
+#define SWPS2_LCTL_STOPERREN (0x1 << 3)
+#define SWPS2_LCTL_ACKERREN (0x1 << 2)
+#define SWPS2_LCTL_PARERREN (0x1 << 1)
+#define SWPS2_LCTL_RXDTOEN (0x1 << 0)
+
+/* SW_PS2_FSTAT */
+#define SWPS2_FSTA_RXRDY (1 << 0)
+#define SWPS2_FSTA_RXOF (1 << 1)
+#define SWPS2_FSTA_RXUF (1 << 2)
+#define SWPS2_FSTA_TXRDY (1 << 8)
+#define SWPS2_FSTA_TXOF (1 << 9)
+#define SWPS2_FSTA_TXUF (1 << 10)
+
+#define SW_PS2_SAMPLE_CLK (1000000)
+#define SW_PS2_SCLK (125000)
+
+struct sunxips2data {
+ int irq;
+ spinlock_t ps2_lock;
+ void __iomem *base_address; /* virt address of control registers*/
+ struct serio *serio; /* serio*/
+ struct device *dev;
+ struct clk *pclk;
+};
+
+/*********************/
+/* Interrupt handler */
+/*********************/
+static irqreturn_t sunxips2_interrupt(int irq, void *dev_id)
+{
+ struct sunxips2data *drvdata = dev_id;
+ u32 intr_status;
+ u32 fifo_status;
+ unsigned char byte;
+ u32 rval;
+ u32 error = 0;
+
+ spin_lock(&drvdata->ps2_lock);
+
+ /* Get the PS/2 interrupts and clear them */
+ intr_status = readl(drvdata->base_address + SW_PS2_LSTAT);
+ fifo_status = readl(drvdata->base_address + SW_PS2_FSTAT);
+
+ /*Check Line Status Register*/
+ if (intr_status & 0x10f) {
+ if (intr_status & 0x08)
+ dev_info(drvdata->dev, "PS/2 Stop Bit Error!");
+ if (intr_status & 0x04)
+ dev_info(drvdata->dev, "PS/2 Acknowledge Error!\n");
+ if (intr_status & 0x02)
+ dev_info(drvdata->dev, "PS/2 Parity Error!\n");
+ if (intr_status & 0x100)
+ dev_info(drvdata->dev, "PS/2 Transmit Data Timeout!\n");
+ if (intr_status & 0x01)
+ dev_info(drvdata->dev, "PS/2 Receive Data Timeout!\n");
+
+ writel(readl(drvdata->base_address + SW_PS2_GCTRL)|0x4, drvdata->base_address + SW_PS2_GCTRL);/*reset PS/2 controller*/
+ writel(0x10f, drvdata->base_address + SW_PS2_LSTAT);
+
+ error = 1;
+ }
+
+ /*Check FIFO Status Register*/
+ if (fifo_status & 0x0606) {
+ if (fifo_status & 0x400)
+ dev_info(drvdata->dev, "PS/2 Tx FIFO Underflow!\n");
+ if (fifo_status & 0x200)
+ dev_info(drvdata->dev, "PS/2 Tx FIFO Overflow!\n");
+ if (fifo_status & 0x04)
+ dev_info(drvdata->dev, "PS/2 Rx FIFO Underflow!\n");
+ if (fifo_status & 0x02)
+ dev_info(drvdata->dev, "PS/2 Rx FIFO Overflow!\n");
+
+ writel(readl(drvdata->base_address + SW_PS2_GCTRL)|0x4, drvdata->base_address + SW_PS2_GCTRL); /*reset PS/2 controller*/
+ writel(0x707, drvdata->base_address + SW_PS2_FSTAT);
+ error = 1;
+ }
+
+ rval = (fifo_status >> 16) & 0x3;
+ while (!error && rval--) {
+ byte = readl(drvdata->base_address + SW_PS2_DATA) & 0xff;
+ dev_info(drvdata->dev, "PS/2 Receive %02x\n", byte);
+ serio_interrupt(drvdata->serio, byte, 0);
+ }
+
+ writel(intr_status, drvdata->base_address + SW_PS2_LSTAT);
+ writel(fifo_status, drvdata->base_address + SW_PS2_FSTAT);
+
+ spin_unlock(&drvdata->ps2_lock);
+
+ return IRQ_HANDLED;
+}
+
+static int sunxips2_open(struct serio *pserio)
+{
+ struct sunxips2data *drvdata = pserio->port_data;
+ u32 src_clk = 0;
+ u32 clk_scdf;
+ u32 clk_pcdf;
+ u32 rval;
+
+ /*Set Line Control And Enable Interrupt*/
+ rval = SWPS2_LCTL_TXDTOEN|SWPS2_LCTL_STOPERREN|SWPS2_LCTL_ACKERREN|SWPS2_LCTL_PARERREN|SWPS2_LCTL_RXDTOEN;
+ writel(rval, drvdata->base_address + SW_PS2_LCTRL);
+
+ /*Reset FIFO*/
+ writel(0x3<<16 | 0x607, drvdata->base_address + SW_PS2_FCTRL);
+
+ src_clk = clk_get_rate(drvdata->pclk);
+
+ if (!src_clk) {
+ dev_info(drvdata->dev, "w_ps2c_set_sclk error, source clock is 0.");
+ return -1;
+ }
+
+ /*Set Clock Divider Register*/
+ clk_scdf = ((src_clk + (SW_PS2_SAMPLE_CLK>>1)) / SW_PS2_SAMPLE_CLK - 1);
+ clk_pcdf = ((SW_PS2_SAMPLE_CLK + (SW_PS2_SCLK>>1)) / SW_PS2_SCLK - 1);
+ rval = (clk_scdf<<8) | clk_pcdf;/* | (PS2_DEBUG_SEL<<16);*/
+ writel(rval, drvdata->base_address + SW_PS2_CLKDR);
+
+ /*Set Global Control Register*/
+ rval = SWPS2_RESET|SWPS2_INTEN|SWPS2_MASTER|SWPS2_BUSEN;
+ writel(rval, drvdata->base_address + SW_PS2_GCTRL);
+
+ udelay(100);
+
+ return 0;
+}
+
+static void sunxips2_close(struct serio *pserio)
+{
+ struct sunxips2data *drvdata = pserio->port_data;
+
+ spin_lock(&drvdata->ps2_lock);
+ /* Disable the PS2 interrupts */
+ writel(0, drvdata->base_address + SW_PS2_GCTRL);
+ spin_unlock(&drvdata->ps2_lock);
+}
+
+static int sunxips2_write(struct serio *pserio, unsigned char val)
+{
+ struct sunxips2data *drvdata = (struct sunxips2data *)pserio->port_data;
+ u32 timeout = 10000;
+
+ do {
+ if (readl(drvdata->base_address + SW_PS2_FSTAT) & SWPS2_FSTA_TXRDY) {
+ writel(val, drvdata->base_address + SW_PS2_DATA);
+ return 0;
+ }
+ } while (timeout--);
+
+ return -1;
+}
+
+static int sunxips2_probe(struct platform_device *ofdev)
+{
+ struct resource *res; /* IO mem resources */
+ struct sunxips2data *drvdata;
+ struct serio *serio;
+ struct device *dev = &ofdev->dev;
+ unsigned int irq;
+ int error;
+
+ drvdata = devm_kzalloc(dev, sizeof(struct sunxips2data), GFP_KERNEL);
+ serio = devm_kzalloc(dev, sizeof(struct serio), GFP_KERNEL);
+ if (!drvdata || !serio)
+ error = -ENOMEM;
+
+ /* Request clock */
+ drvdata->pclk = clk_get(dev, NULL);
+ if (IS_ERR(drvdata->pclk))
+ dev_dbg(dev, "couldn't get clock %li\n",
+ PTR_ERR(drvdata->pclk));
+
+ if (!IS_ERR(drvdata->pclk)) {
+ error = clk_prepare_enable(drvdata->pclk);
+ if (error < 0) {
+ dev_err(dev, "failed to enable clock %d\n", error);
+ return error;
+ }
+ }
+
+ /* IO */
+ res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
+ drvdata->base_address = devm_ioremap_resource(dev, res);
+ if (IS_ERR(drvdata->base_address)) {
+ dev_err(dev, "failed to map registers\n");
+ error = PTR_ERR(drvdata->base_address);
+ }
+
+ serio->id.type = SERIO_8042;
+ serio->write = sunxips2_write;
+ serio->open = sunxips2_open;
+ serio->close = sunxips2_close;
+ serio->port_data = drvdata;
+ serio->dev.parent = dev;
+ strlcpy(serio->name, dev_name(dev), sizeof(serio->name));
+ strlcpy(serio->phys, dev_name(dev), sizeof(serio->phys));
+
+ platform_set_drvdata(ofdev, drvdata);
+ serio_register_port(serio);
+
+ /* Get IRQ for the device */
+ irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+ if (!irq) {
+ dev_err(dev, "no IRQ found\n");
+ return -ENODEV;
+ }
+
+ drvdata->irq = irq;
+ drvdata->serio = serio;
+ drvdata->dev = dev;
+ error = devm_request_any_context_irq(drvdata->dev, drvdata->irq, &sunxips2_interrupt, 0,
+ DRIVER_NAME, drvdata);
+ if (error) {
+ dev_err(drvdata->dev,
+ "Couldn't allocate interrupt %d : error: %d\n", drvdata->irq, error);
+ return error;
+ }
+ return 0; /* success */
+}
+
+static int sunxips2_remove(struct platform_device *of_dev)
+{
+ struct sunxips2data *drvdata = platform_get_drvdata(of_dev);
+
+ if (!IS_ERR(drvdata->pclk)) {
+ clk_disable_unprepare(drvdata->pclk);
+ clk_put(drvdata->pclk);
+ }
+ serio_unregister_port(drvdata->serio);
+ mdelay(2);
+ return 0;
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id sunxips2_of_match[] = {
+ { .compatible = "allwinner,sun7i-a20-ps2", },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, sunxips2_of_match);
+
+/*platform driver structure*/
+static struct platform_driver sunxips2_of_driver = {
+ .probe = sunxips2_probe,
+ .remove = sunxips2_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = sunxips2_of_match,
+ },
+};
+module_platform_driver(sunxips2_of_driver);
+
+MODULE_AUTHOR("Aaron.maoye<leafy.myeh-Q9AEpCAkrSgqDJ6do+/SaQ@public.gmane.org, "
+ "Vishnu Patekar <vishnupatekar0510-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>");
+MODULE_DESCRIPTION("Sunxi PS/2 driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5